A good coffee grinder is as important as a good coffee machine. Buying a coffee grinder should be based on the amount of coffee needed to be ground and the type of grind you are in need of. Some grinders are more suited for filter coffees (coarse grind) and others for espresso (fine grind). Many home use and commercial grinders alike can both provide great consistency when grinding for any type of coffee brewing but vary in consistency and the speed of which they grind.
We recommend buying a coffee grinder based on the quality of coffee desired and the amount you need to grind on a daily basis. The general rule is to spend as much as you can afford as it affects the flavour of the final brewed coffee greatly.